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5 g sulphur is present in 100 g of C S 2 . Δ T b of solution 0.954 and K b is 4.88. The molecular formula of sulphur is

Options

  1. AS 2
  2. BS 4
  3. CS 3
  4. DS 8

Correct answer

D. S 8

Step-by-step solution

ΔT b = K b × m m = Δ T b K b or W 2 × 1000 M 2 × W 1 = Δ T b K b or 5 × 1000 M 2 × 100 = 0.954 4.88 M 2 = 256 Atomic weight of sulphur = 32 Number of sulphur atom = M o l e c u l a r weight A t o m i c weight = 256 32 = 8 Hence Molecular formula = S 8 .

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